Coil-heater.



A. H.- MERRILL.

GOIL HEATER.

APPLICATION FILED NOV. 7, 1910.

Patented Apr. 25, 191 1.

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ALFRED H. MERRILL, OF TOLEDO, OHIO.

COIL-HEATER.

Specification of Letters Patent.

Patented Apr. 25, 1911.

Application filed November 7, 1910. Serial No. 590,961.

To all whom it may concern:

Be it known that I, ALFRED H. MERRILL, a citizen of the United States,residing at Toledo, Lucas county, Ohio, have invented a new and usefulCoil-Heater, of which the following is a specification.

This invention relates to a water tube heating structure.

This invention has utility when embodied in a hot water heater such asfor instantaneous heating, domestic use or radiator system.

Referring to the drawings: Figure l is a perspective view with partsbroken away showing an embodiment of the invention adapted to a waterheater; Fig. 2 is a section thereof showing position for removal ofparts; and Fig. 3 is a detail of one of the manifolds.

The down or return line 1 is connected to the manifold 2 which hasopening 3 near the upper side thereof, and opening 4 near the lower sidethereof. These manifold openings are provided with union elements 5adjacent opening 6 in the heater housing 7 through which opposingelements 8 of the connecting means may serve to unite the coil havingsection 9 in communication by line 10 with the discharge pipe 11 havingunion connecting element 12 movable to protrude through housing opening13 and thereby enter into mounting relation with the opposing unionelement 14: carried by the riser manifold 15 having similar structure tothe return manifold 2. This manifold 15 is connected to the riser line16 which may extend to a radiator heating system having the return line1.

Placed in the lower part of the housing 7 is a burner 17 shown as of gastype having control valve 18 from the gas supply line 19. The housing 7has removable top 20 through which the exhaust flue passage 21 may be incommunication with the stack or chimney.

In the same plane as the riser coil section 9 is riser 22 to'the coil 23in the housing 7. This coil 23 is remote from the burner 17 and adjacentthe flue 21. The coil 23 has line 24 in communication with line 11 intowhich coil 9 discharges. These coils 9 and 23 are in a common plane andare riser coils. The former, being adjacent the, burner, may beconsidered the primary or main heating coil to be normally operablewhile the coil section 23 may be considered secondary and effective toabstract from the products of combustion such remaining heat as mayexist and supply its heated water to the riser manifold 15 at such raterelative to the circulation through coil 9 as the relative areas of thecoils and the heating produced may develop. Considerable advantageaccrues from this coil structure in that extension of coil 9 say to thelimit occupied by coil section 23 might result in a heating of the finegases by radiation from the coil at this remote point from the burner.Such direct heat loss might be avoided by this branching of the coil andplacing them selectively in parallel. The coil itself may be compactlyand economically shaped up from tubing with say electric welds to unitethe branched coils. The building of the coil in a common plane as tosections 9 and 23 renders it compact and units may be built up inparallel to such extent as may be found necessary. In the instance shownherein, the coils are shown in three groups of three each, the groupingbeing as shown in Fig. 3 with the coils connected to the openings in themanifold 3, 4, 25, 26, 27, 28, 29, 30 and 31.

Instead of firepot structure or general extent burner, there is shown inthis instance a burner separately controlled for each set of three ofthe coils. This will permit of running the heater at any reduced ratedesired.

A feature of considerable importance in practice has to do with thesetting up as well taking down of the coils which may become defectivefrom use or misuse. This disconnecting may be readily and simplyaccomplished in this device by merely disconnecting the unions 14L and 5from the coil it is desired to remove and rocking the coil in thehousing so that the union elements 8 and 12 are free of the openings 6and 13. When so released from the housing, as shown in Fig. 2 with thetop ready for removal as also shown in this figure, the coil may bedrawn upward, the ends plugged, or a substitute coil installed.Staggering the coils permits of more easy access to the unions.

What is claimed and it is desired to secure by Letters Patent is:

1. The combination of a heater having a housing, a pair of manifoldsexterior of said housing, and an upward flow coil in the housing andprotruding therefrom to connect said manifolds, the portion of the coilI Within the housing being branched to form tWo flow lines between themanifolds.

2. The combination in a heater having a combustion chamber of a pair ofmanifolds exterior of said chamber, adjacent parallel manifoldconnecting coils each having a branch separating therefrom and joiningthereto Within said chamber, each branch and its coil lying in a commonplane.

3. The combination in a heater having a housing, a burner in saidhousing, and a plurality of adjacent similar continuous flow ALFRED H.MERRILL.

Vitnesses:

C. H. RAUoH, GEO. E. KIRK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

